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Charges and Credits - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Charges and credits, pre tax |  |  |  |  |  |  |  | $ 723,000,000 |
Charges and credits | $ 0 |  | $ 0 |  |  | $ 50,000,000 |  | 667,000,000 |
Promissory note in exchange of accounts receivable |  |  |  |  |  | $ 700,000,000 |  |  |
Promissory note term |  |  |  |  |  | 3 years |  |  |
Promissory note interest rate |  |  |  |  |  | 6.50% |  |  |
Charge relating to one-time mandatory tax on previously deferred foreign earnings |  |  |  | $ 410,000,000 |  |  |  |  | $ 410,000,000
Tax credits resulting from remeasurement of net deferred tax liabilities |  |  |  | 334,000,000 |  |  |  |  |
US tax reform |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Charges and credits |  |  |  | $ 76,000,000 |  |  |  |  |
US tax reform | Tax Year2018 |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Reduced corporate income tax rate |  |  |  |  |  |  |  |  | 21.00%
Impairments and Other | Headcount Reductions |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Charges and credits, pre tax |  | $ 184,000,000 |  |  |  |  |  |  |
Charges and credits |  | $ 164,000,000 |  |  |  |  |  |  |
Merger and Integration |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Charges and credits, pre tax |  |  |  |  |  |  |  | 213,000,000 |
Charges and credits |  |  |  |  |  |  |  | 169,000,000 |
Merger and Integration | Cameron International Corporation |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Charges and credits |  |  |  |  | $ 49,000,000 | $ 81,000,000 |  |  |
Merger and Integration | Merger-related employee benefits | Cameron International Corporation |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Charges and credits |  |  |  |  |  |  | $ 82,000,000 |  |
Promissory Note Fair Value Adjustment and Other |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |
Charges and credits, pre tax |  |  |  |  |  |  |  | 510,000,000 |
Charges and credits |  |  |  |  |  | $ 460,000,000 |  | $ 498,000,000 |

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